Hubert Spiesberger
(Univ. Mainz)
3/27/12, 9:00โฏAM
Heavy flavours
I present predictions for the inclusive production of D- and B-mesons
at the CERN LHC in the general-mass variable-flavor-number scheme
at next-to-leading order, an approach which takes into account the finite
mass of the heavy quarks. Numerical results are compared to data where
available. Measurements at large rapidities have the potential to pin down
models of intrinsic charm.
Adam Edward Barton
(Lancaster University (GB))
3/27/12, 9:18โฏAM
Heavy flavours
ATLAS has studied heavy flavour production in a variety of decay channels and inclusive
signatures including charmed mesons, jets originating from b-quarks and inclusive muons
and electrons. Differential production cross sections for beauty and charm are extracted
from these signatures and compared with a variety of theoretical predictions.
Rosa Romita
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
3/27/12, 9:54โฏAM
Heavy flavours
ALICE is the LHC experiment dedicated to the study of the Quark Gluon Plasma (QGP)
in Pb-Pb collisions. Heavy quarks are ideal probes to explore the QGP formation and
properties, since they experience the full collision history and are expected to be
abundantly produced at the LHC. It is of great importance to measure the heavy flavor
cross section not only in Pb-Pb collisions, but also in...
Prof.
Antoni Szczurek
(Cracow, INP & Rzeszow Univ.)
3/27/12, 10:12โฏAM
Heavy flavours
We discuss charm production at LHC. The production of single $c \bar c$ pairs
is calculated in the $k_t$-factorization approach. We use several
unintegrated gluon distributions from the literature. Some of them
include effect of small-$x$ saturation and fulfill Balitsky-Kovchegov
evolution equation. The hadronization is included with the help of
fragmentation functions found for the...
Karol Kovarik
(KIT)
3/27/12, 11:00โฏAM
Heavy flavours
The production of a prompt photon in association with a heavy-quark (charm or bottom) jet is a versatile process that can be used to study the structure of the proton and the nucleus. This process is extremely sensitive to the heavy quark PDFs, and can thus directly probe for intrinsic charm or bottom contributions. We present various predictions of this process at different colliders and...
Piotr Kotko
3/27/12, 11:18โฏAM
Heavy flavours
We present the consistent treatment of heavy quarks in jet production processes in DIS at NLO accuracy. The method is based on the ACOT massive factorization scheme (Aivazis-Collins-Olness-Tung) which is already in use in global fits for PDFs. Extension of this method to jets faces the problem of infra-red singularities, which have to cancel between real and virtual corrections. Moreover,...
David Calvet
(Univ. Blaise Pascal Clermont-Fe. II (FR))
3/27/12, 11:36โฏAM
Heavy flavours
The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets)
in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV.
The b-jets are identified using either a lifetime-based method, where secondary decay vertices of
b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based
method...
Zlatka Georgieva Staykova
(University of Antwerp (BE))
3/27/12, 11:54โฏAM
Heavy flavours
The inclusive photoproduction of D* mesons and of D*-tagged dijets is investigated with the H1 detector at the $ep$ collider HERA. The kinematic region covers small photon virtualities $Q^{2} < 2\ {\rm GeV}^2$ and photon-proton centre-of-mass energies of $100 < W_{\gamma p} < 285\ {\rm GeV}$. Inclusive \dstar\ meson differential cross sections are measured for central rapidities $|\eta(D*)| <...
Irakli Garishvili
(Lawrence Livermore Nat. Laboratory (US))
3/27/12, 12:12โฏPM
Heavy flavours
Heavy flavor quarks are produced in the early stages of heavy ion
collisions and serve as an important probe of the strongly interacting
deconfined medium believed to be produced in these collisions at RHIC.
Measuring observables such as Nuclear Modification Factor and Elliptic
Flow for open heavy flavor production can help in quantifying medium
effects.
Measurement of heavy flavor...
Ganna Dolinska
(Kiev University)
3/27/12, 2:00โฏPM
Heavy flavours
The production of D*, D+, D0, Ds and Lambda_c charm hadrons and their antiparticles in ep scattering at HERA was studied with the ZEUS detector using the full HERA II data set. The measurement has been performed in the photoproduction regime. The fractions of c quarks hadronising as a particular charm hadron, f(c -> D, Lambda_c), were derived in the visible kinematic range. The obtained...
Alexander Mitov
(CERN)
3/27/12, 2:18โฏPM
Heavy flavours
The current state of the art in top-pair production is based on threshold resummation on top of the exact NLO result. We will examine the role - and the limitations - of the soft-gluon approximation in describing precision top-pair production at hadron colliders. We will demonstrate that the only way to substantially improve our knowledge of this observable is through fixed order calculation...
Nikolaos Kidonakis
(Kennesaw State University)
3/27/12, 2:36โฏPM
Heavy flavours
I present theoretical results at approximate NNLO for top quark production at the LHC at 7 and 8 TeV energy. Total cross sections are shown for ttbar production and single top production in the t and s channels and via associated tW production.Top quark transverse momentum and rapidity distributions are also presented.
Kate Shaw
(Abdus Salam Int. Cent. Theor. Phys. (IT))
3/27/12, 2:54โฏPM
Heavy flavours
We present measurements of the production of top quarks in
proton-proton collisions at 7 TeV with the ATLAS detector at the Large
Hadron Collider. The cross section of pair-produced top quarks is
measured in several channels, including the single lepton, dilepton
and all hadronic channel, some using information from b-tagging.
Antonio Tropiano
(Universita e INFN (IT))
3/27/12, 3:12โฏPM
Heavy flavours
We present precise measurements of the top quark pair production cross
section at 7 TeV, performed using CMS data collected in 2010-2011. The
total cross section is measured in the lepton+jets, dilepton and fully
hadronic channels, including the tau-dilepton and tau+jets modes. The
results are combined and confronted with precise theory calculations. We
also obtain an indirect constraint...
Karel Soustruznik
(C)
3/27/12, 3:30โฏPM
Heavy flavours
We present measurements of the cross sections for the production
of top-antitop quark pair production via the strong interaction and
for the production of single top quarks via the weak interaction in
proton-antiproton collisions at sqrt(s)=1.96 TeV using data
corresponding to integrated luminosities of up to 5.4 fb-1. The data
were collected with the D0 detector at the Fermilab Tevatron...
Konstantinos Vellidis
(University of Athens (GR))
3/27/12, 3:48โฏPM
Heavy flavours
The study of the dynamics of top-quark pair production in
proton-proton and proton-antiproton collisions plays an important role
in the understanding of parton interactions at large Bjorken-x. It
tests the assumptions of the standard model and of quantum
chromodynamics at the electroweak scale and beyond. The CDF data set
is an ideal sample for measuring observables sensitive to the...
Christian Andreas Jung
(TU Dortmund),
Christian Andreas Jung
(Technische Universitaet Dortmund (DE))
3/27/12, 4:30โฏPM
Heavy flavours
We present a measurement of the top-quark mass in proton-proton
collisions at 7 TeV with the ATLAS detector at the Large Hadron
Collider. The top mass is determined by making use of a
two-dimensional template method in the single lepton channel. An
indirect extraction of the top-quark mass from the measurement of the
cross-section is also presented.
Tim Head
(The University of Manchester),
Timothy Head
(University of Manchester)
3/27/12, 4:48โฏPM
Heavy flavours
Merged abstract:
"Measurement of the top quark mass at D0"
"Measurements of top quark properties at D0"
Minoru Hirose
(Osaka University (JP)),
Minoru Hirose
(Osaka University)
3/27/12, 5:06โฏPM
Heavy flavours
Merged abstract:
"Top quark properties"
"Top quark pair properties"
Sven-Olaf Moch
(Unknown)
3/27/12, 5:24โฏPM
Heavy flavours
We discuss heavy-flavor production in association with one jet
hadronic collisions matched to parton shower Monte Carlo programs at next-to-leading order QCD with account of top-quark decays
and spin correlations in the decay products.
The calculation builds on existing results for the radiative corrections to heavy-quark plus one jet production and uses the POWHEG BOX for the interface to...
Adam Kardos
(University of Debrecen)
3/27/12, 5:42โฏPM
Heavy flavours
Aiming at better understanding of the properties of top quarks, we focus on top--antitop+X production at the LHC, with X being a vector, or scalar/pseudoscalar boson. We show predictions obtained by PowHel, a
computing framework based upon the POWHEG-BOX program with input
obtained from HELAC-NLO. The POWHEG-BOX generates event files
according to the Les-Houches accord, and uses the POWHEG...
Susan Cheatham
(McGill University (CA))
3/28/12, 11:30โฏAM
Heavy flavours
The production of Quarkonium is an important testing ground for QCD calculations. The J/
psi and Upsilon production cross-sections are measured in proton-proton collisions at the
ATLAS detector. Differential cross sections as a function of transverse momentum and
pseudorapidity will be presented. The fraction of J/\psi produced in $B$-hadron decays are
also measured and the differential...
Daniele Fasanella
(Universita e INFN (IT)),
Daniele Fasanella
(INFN)
3/28/12, 11:48โฏAM
Heavy flavours
Abstract missing
Prof.
Bernd Kniehl
(Univ. Hamburg)
3/28/12, 1:30โฏPM
Heavy flavours
We study the polarization observables of $J/\psi$ hadroproduction
at NLO in NRQCD, including the $^3\!P_J^{[8]}$ channel.
Exploiting the color-octet long-distance matrix elements previously extracted through a global fit to unpolarized $J/\psi$ production
data, we provide theoretical predictions in the helicity and Collins-Soper frames and compare them with data from CDF and ALICE.
The...
Ionut Cristian Arsene
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
3/28/12, 1:48โฏPM
Heavy flavours
Due to their large mass, heavy quark pairs are considered to be produced in the first instants
of the collision in hard scatterings of partons which can be described perturbatively. However, the bound states of these pairs
are produced via soft non-perturbative processes. The interplay between the perturbative and
non-perturbative processes involved in quarkonium production makes this...
Mr
Akihisa Takahara
(CNS, University of Tokyo and JRA RIKEN)
3/28/12, 2:06โฏPM
Heavy flavours
Title:J/psi Photoproduction in ultra-peripheral Au+Au collisions measured by RHIC-PHENIX.
Ultra-peripheral collisions are heavy-ion collisions with impact parameter larger than twice the nuclear radius.
Since there is no nuclear overlap, strong interactions cannot occur and
ions interact through photon-ion (coherent), photon-nucleus (incoherent), and photon photon...
Manuel Kambeitz
3/28/12, 2:24โฏPM
Heavy flavours
We report recent studies on heavy flavor production in 1.96 TeV proton-antiproton collisions
collected by the CDF detector. These include a new measurement of the spin-alignment of Y mesons using dimuon decays in 6.7 fb^-1
of data. This measurement is the first to report the full angular distributions of dimuons
as functions of Y transverse momentum in both the CollinsโSoper and sโchannel...
Giovanni Sabatino
(Universita degli Studi di Roma Tor Vergata (IT))
3/28/12, 2:42โฏPM
Heavy flavours
Studies of quarkonia production in the forward region provide important tests of NRQCD. During 2010 and 2011 the LHCb experiment has collected a dataset corresponding to an integrated luminosity of 1 fb-1 in proton-proton collisions at sqrt(s)= 7 TeV. We present studies based on 40 to 1000 fb-1 of data, including the production of the J/psi, psi(2S), Chi_c charmonium together with Upsilon...
Jolanta Brodzicka
(INP Krakow)
3/28/12, 3:00โฏPM
Heavy flavours
We present recent results on charmonium and charmonium-like states
studied by the Belle experiment at the KEK-B e+e- collider.
After years of interesting discoveries in the field of hadron
spectroscopy, Belle continues the research by measuring new final
states produced in various processes accessible at the B-Factories.
Main motivation is to complete the spectrum of charmonia...
Elisa Fioravanti
(INFN Ferrara)
3/28/12, 3:18โฏPM
Heavy flavours
Charmonium and charmonium-like states are a unique system for studying QCD and possibly exotic bound states. We present new results on such states, which are created in two-photon fusion or in electron-positron collisions and decaying into a variety of final states, including psi pi pi, eta_c pi pi, and J/psi omega.
Umberto Tamponi
(Torino)
3/28/12, 4:00โฏPM
Heavy flavours
The Belle collaboration recently reported the discovery of the p-wave
Bottomonium singlets, hb(1P) and hb(2P), the surprising observation of
resonant substructure in Y(5S) --> pi+pi-Y(nS), hb(mP) (n=1-3, m=1,2), and the first observation of the radiative transition hb(1P) --> gamma
etab(1S) in 121.4 1/fb of data collected near the Upsilon(5S) resonance
at the KEKB asymmetric-energy e^+e^-...
Claus Buszello
(Uppsala University (SE)),
Claus Buszello
(Department of Physics and Astronomy-University of Uppsala),
Claus Buszello
(Uppsala University)
3/28/12, 4:18โฏPM
Heavy flavours
Using the 1.3 fb$^{-1}$ sample of D0 RunII data taken between 2002 and 2006, we observe a new state decaying into $\Upsilon(1S) + \gamma$, where the $\Upsilon(1S)$ is detected by its decay into an oppositely charged muon pair, and the photon is reconstructed by its conversion into an electron-positron pair. The significance of this structure is six standard deviations and its mass is...
Dr
Zhenwei Yang
(Tsinghua University (CN))
3/28/12, 4:36โฏPM
Heavy flavours
During the year 2011, the LHCb experiment has accumulated 1 fb-1 of data in proton-proton collisions data at 7 TeV, collecting a sample rich in both Bc mesons and b baryons. Studies of these states provide a wealth of new measurements as well as probes of QCD theory predictions. We will present studies of Bc production together with precision measurements of both the mass and lifetime, in...
Enrique Camacho Perez
(Centro Invest. Estudios Avanz. IPN (MX))
3/28/12, 4:54โฏPM
Heavy flavours
Merged abstract:
"Analysis of the decay $B_s^0 \rightarrow J/\psi K^+ K^-$ $M(K^+K^-)>1.35$~GeV"
"Measurement of the $\Lambda_b$ lifetime in the $\Lambda_b \to J/\psi \Lambda$ exclusive decay channel using the full D0 dataset"
Marcus Ebert
(SLAC)
3/28/12, 5:12โฏPM
Heavy flavours
Decays of B mesons into final states containing baryons are much less understood than decays into mesons, and are useful for shedding light on baryon-production mechanisms and intermediate states. We report the results of recent and new studies of such decays, including B- -->Sigma_c++ pbar pi- pi-, B0bar -->Lambda_c+ pbar p pbar, and
B --> D(*) p pbar (npi). Both the total decay rates and...
